CN102005908B - Pulse switch control device and control method - Google Patents

Abstract

The invention relates to a pulse switch control device and a control method. The pulse switch control device includes an H-type bridge transmitting pulse module composed of a first switch unit, a second switch unit, a third switch unit and a fourth switch unit, the first and fourth switch units, the second and the third switch unit Form a diagonal switch group, the first and third switch units, the second and the fourth switch unit form a relative switch group, and also include a control module, the control module is connected with each switch unit respectively, and is used to control a The switch unit in the diagonal switch group is turned on, and the switch unit in the other diagonal switch group is turned off, forming a pulse loop. When the transmission pulse stops, the switch unit in one opposite switch group is controlled to be turned on, and the other opposite switch unit is turned on. The switching units in the group are turned off, forming a discharge circuit. The invention effectively eliminates the pulse current or voltage tailing and effectively reduces the waveform distortion of the pulse current or voltage by forming a discharge circuit.

Description

Pulse switch control device and control method

technical field

The invention relates to a pulse emission technology, in particular to a pulse switch control device and a control method.

Background technique

Due to the advantages of simple control, fast switching speed, and bipolar output, the H-bridge transmitting pulse circuit is widely used in various devices as a switching converter for power conversion. For example, in the high-frequency high-voltage pulse power supply for electric dehydration and desalination of crude oil, the pulse switch control device is one of the more important components. The pulse switch control device uses the switching converter as the core to convert electric energy and realize electric power output. As another example, in the submarine oil and gas resource exploration launch device, the pulse switch control device is used to output the ideal current square wave.

FIG. 1 is a schematic structural diagram of an existing H-bridge transmitting pulse circuit. As shown in Figure 1, the main structure of the H-type bridge transmitting pulse circuit includes four equivalent switching devices K ₁ , K ₂ , K ₃ and K ₄ , and each equivalent switching device can be connected in series and parallel by multiple single switching devices made. In terms of control mode, the existing H-bridge transmitting pulse circuit adopts a paired control mode, namely: equivalent switching devices K ₁ and K ₄ , equivalent switching devices K ₂ and K ₃ are controlled by control signals u ₁₄ and u ₂₃ respectively control. When the control signal u ₁₄ is the on control signal and the control signal u ₂₃ is the off control signal, the equivalent switching devices K ₁ and K ₄ are turned on, and the current flows from the positive pole of the power supply through the equivalent switching device K ₁ , load R _L , The equivalent switching device K ₄ flows into the negative pole of the power supply, and the current flow direction on the load _RL is from node A to node B, and the load state at this time is defined as a positive voltage pulse. When the positive voltage pulse is switched to the zero voltage, the equivalent switching devices K ₁ and K ₄ need to be turned off, that is, the four equivalent switching devices are all in the off state at this time. When the control signal u ₂₃ is the on control signal and the control signal u ₁₄ is the off control signal, the equivalent switching devices K ₂ and K ₃ are turned on, and the current flows from the power supply through the equivalent switching device K ₃ , the load _RL , etc. The effective switching device K ₂ flows into the negative pole of the power supply, and the current flow direction on the load _RL is from node B to node A, and the load state at this time is defined as a negative voltage pulse.

Actual use shows that with the different operating conditions of the system, the load _RL has different characteristics, which is a very complex equivalent load. In some working conditions, the load _RL is resistive, but in most other working conditions, the load _RL is inductive or capacitive. Figure 2a and Figure 2b are schematic diagrams of ideal and actual voltage or current waveforms, respectively. In the ideal case where the load is resistive, a bipolar rectangular wave is applied to the load, as shown in Figure 2a. However, when the load is inductive or capacitive, the waveform of the current or voltage applied to the load is seriously distorted, and the front edge of the waveform rises exponentially, and the trailing edge declines obliquely, causing the waveform to tail, as shown in Figure 2b. In addition, even when the load is resistive, due to the off-delay of the pulse electronic switching device, the current or voltage applied to the load will also have a waveform as shown in Figure 2b. Research shows that trailing edge falling tail waveform will seriously affect the working performance of the load. In actual use, it is hoped that the shorter the tailing time of the trailing edge waveform, the better.

Taking the application of crude oil electric dehydration and desalination as an example, the impact of trailing edge and trailing waveform on load performance is specifically reflected in:

(1) When the electric dehydration and desalination load is inductive, the current cannot change suddenly, and the magnetic field energy stored in the load needs to be released by a suitable circuit. The diode provides a freewheeling circuit for the coil winding, and because the internal resistance of the power supply is small relative to the load impedance, the coil discharges to the power supply. In the process of generating negative pulses, the current loop is: node A→equivalent switching device K ₂ →power negative pole→power positive pole→equivalent switching device K ₃ →node B→load _RL →node A. When the negative-going pulse voltage switches to zero-going voltage, the current loop is: node A→equivalent switching device K ₁ →positive power supply→negative power supply→equivalent switching device K ₄ →node B→load _RL →node A. It can be seen that when the electric dehydration and desalination load is inductive, because the energy of the load is difficult to release in a short time, it will affect the frequency, duty cycle and pulse width of the electric dehydration and desalination power supply pulse, and cannot provide a high-frequency pulse electric field.

(2) When the electric dehydration and desalination load is capacitive, the load voltage cannot change suddenly, and the electric field energy stored in the capacitive load needs to be released by a suitable circuit. However, because the existing paired control method of the H-bridge transmitting pulse circuit cannot provide a suitable discharge circuit, it will also affect the frequency, duty cycle and pulse width of the electric dehydration and desalination power supply pulse, and cannot provide a high-frequency pulse electric field.

(3) The previous analysis shows that due to the need to discharge to the power supply, the electronic devices in the power supply will be impacted during the discharge process, which not only reduces the reliability of the power supply, but also shortens the service life of the power supply.

(4) At the same time, the impact on the DC power supply when discharging to the power supply will be coupled to other windings of the switching power supply transformer, causing the voltage instability of the multi-channel transformer and its windings.

Contents of the invention

The technical problem to be solved by the present invention is to provide a pulse switch control device and control method, which can effectively eliminate the pulse current or voltage tailing caused by the inductive load, the capacitive load, and the turn-off delay of the pulse electronic switching device, and reduce the Waveform distortion of small pulses of current or voltage.

In order to solve the above technical problems, the present invention provides a pulse switch control device, including an H-bridge transmitting pulse module composed of a first switch unit, a second switch unit, a third switch unit and a fourth switch unit, the The first switch unit and the fourth switch unit, the second switch unit and the third switch unit form a diagonal switch group, and the first switch unit and the third switch unit, the second switch unit and the fourth switch unit form an opposite switch group ; Also includes a control module, the control module is respectively connected with each switch unit, for controlling the conduction of the switch unit in one diagonal switch group when transmitting the pulse, and the switch unit in the other diagonal switch group is turned off , forming a pulse loop, when the emission pulse stops, the switch unit in one relative switch group is controlled to be turned on, and the switch unit in the other relative switch group is turned off, forming a discharge circuit.

Further, the control module includes a first control terminal, a second control terminal, a third control terminal and a fourth control terminal, wherein the first control terminal is used to control the first switch unit to transmit positive pulses Turn on, turn off when the forward pulse is stopped; the second control terminal is used to control the second switch unit to turn off when the forward pulse is sent, and turn on when the forward pulse stops; the third control terminal , used to control the third switch unit to turn off when transmitting forward pulses and stopping sending forward pulses; the fourth control terminal is used to control the fourth switching unit to turn off when transmitting forward pulses and stopping sending forward pulses time conduction.

Further, the control module includes a first control terminal, a second control terminal, a third control terminal and a fourth control terminal, wherein the first control terminal is used to control the first switch unit to transmit forward pulses and Turning on when transmitting positive pulses stops; the second control terminal is used to control the second switch unit to turn off when transmitting positive pulses and stopping transmitting positive pulses; the third control terminal is used to control the third switch The unit is turned off when transmitting positive pulses, and is turned on when transmitting positive pulses stops; the fourth control terminal is used to control the fourth switch unit to be turned on when transmitting positive pulses, and is turned on when transmitting positive pulses. off.

Further, the control module includes a first control terminal, a second control terminal, a third control terminal and a fourth control terminal, wherein the first control terminal is used to control the first switch unit to transmit negative pulses and turn off when the emission of negative pulses stops; the second control terminal is used to control the second switch unit to be turned on when the emission of negative pulses and the emission of negative pulses stop; the third control terminal is used to control the third The switch unit is turned on when the negative pulse is emitted, and is turned off when the negative pulse is stopped; the fourth control terminal is used to control the fourth switch unit to be turned off when the negative pulse is emitted, and is turned off when the negative pulse is stopped. time conduction.

Further, the control module includes a first control terminal, a second control terminal, a third control terminal and a fourth control terminal, wherein the first control terminal is used to control the first switch unit to transmit negative pulses Turn off, turn on when the emission of negative pulses stops; the second control terminal is used to control the second switch unit to turn on when the emission of negative pulses stops, and turn off when the emission of negative pulses stops; the third control terminal , used to control the third switch unit to be turned on when the negative pulse is transmitted and the negative pulse is stopped; the fourth control terminal is used to control the third switch unit to be turned on when the negative pulse is transmitted and the negative pulse is stopped off.

On the basis of the above technical solution, one end of the first switch unit and the second switch unit are connected through the first node, and the other ends are respectively connected to the positive and negative poles of the power supply, and one end of the third switch unit and the fourth switch unit are connected through The second node is connected, the other end is respectively connected to the positive and negative poles of the power supply, a load is set between the first node and the second node, and a discharge load is set on the discharge circuit.

In order to solve the above technical problems, the present invention also provides a pulse switch control method, the pulse switch includes an H-type bridge transmitting pulse circuit composed of a first switch unit, a second switch unit, a third switch unit and a fourth switch unit , the first switch unit and the fourth switch unit, the second switch unit and the third switch unit form a diagonal switch group, the first switch unit and the third switch unit, the second switch unit and the fourth switch unit form Relative switch group; said method includes:

When transmitting pulses, send a turn-on control signal to the switch unit in one diagonal switch group, and send a turn-off control signal to the switch unit in the other diagonal switch group to form a pulse loop;

When the transmitting pulse stops, a turn-on control signal is sent to the switch unit in one opposite switch group, and a turn-off control signal is sent to the switch unit in the other opposite switch group, forming a discharge circuit.

Further, the sending a turn-on control signal to a switch unit in one diagonal switch group and sending a turn-off control signal to a switch unit in another diagonal switch group is specifically:

sending a turn-on control signal to the first switch unit and the fourth switch unit, and sending a turn-off control signal to the second switch unit and the third switch unit; or

Sending a turn-off control signal to the first switch unit and the fourth switch unit, and sending a turn-on control signal to the second switch unit and the third switch unit.

Further, the sending a turn-on control signal to a switch unit in one relative switch group and sending a turn-off control signal to a switch unit in another relative switch group is specifically:

sending a turn-off control signal to the first switch unit and the third switch unit, and sending a turn-on control signal to the second switch unit and the fourth switch unit; or

Sending a turn-on control signal to the first switch unit and the third switch unit, and sending a turn-off control signal to the second switch unit and the fourth switch unit.

The present invention also provides a high-frequency high-voltage pulse power supply adopting the pulse switch control device of the present invention, including a low-voltage DC power supply device, a high-power inverter device, a pulse transformer device, a control device and a detection device, wherein,

The low-voltage DC power supply device is used for rectifying and filtering low-voltage AC power, and outputting a low-voltage DC power supply with adjusted amplitude;

The high-power inverter device is connected to the low-voltage DC power supply device, and is used to invert the low-voltage DC power supply, and output a bipolar low-voltage pulse power supply with adjusted amplitude through duty ratio modulation;

The pulse transformer device is connected with the high-power inverter device, and is used for boosting, rectifying and filtering the bipolar low-voltage pulse power supply, and outputting a high-voltage DC power supply;

The pulse switch control device is connected to the pulse transformer device, and outputs a high-voltage and high-frequency pulse power supply with adjusted frequency to the load;

The detection device is used to monitor the current and voltage of the high-voltage and high-frequency pulse power output by the pulse switch control device to obtain output parameters;

The control device is respectively connected with the low-voltage DC power supply device, high-power inverter device, pulse switch control device and detection device, and is used to adjust the amplitude of the low-voltage DC power supply, the bipolar The amplitude of the low-voltage pulse power supply and the frequency of the high-voltage high-frequency pulse power supply.

The invention provides a pulse switch control device and a control method. By forming a discharge circuit when the forward or reverse pulse is applied to the load, it effectively eliminates the switching off of the inductive load, the capacitive load, and the pulse electronic switching device. The pulse current or voltage tail caused by the delay effectively reduces the waveform distortion of the pulse current or voltage.

Description of drawings

Fig. 1 is the structural representation of existing H-type bridge type transmitting pulse circuit;

Figure 2a and Figure 2b are schematic diagrams of ideal and actual voltage or current waveforms, respectively;

Fig. 3 is the structural representation of pulse switch control device of the present invention;

4a to 4c are working principle diagrams of the first embodiment of the pulse switch control device of the present invention;

5a to 5c are working principle diagrams of the second embodiment of the pulse switch control device of the present invention;

Figure 6a and Figure 6b are working principle diagrams of the third embodiment of the pulse switch control device of the present invention;

Fig. 7a and Fig. 7b are working schematic diagrams of the fourth embodiment of the pulse switch control device of the present invention;

8a to 8c are working principle diagrams of the fifth embodiment of the pulse switch control device of the present invention;

9a to 9c are working principle diagrams of the sixth embodiment of the pulse switch control device of the present invention;

Fig. 10a and Fig. 10b are working principle diagrams of the seventh embodiment of the pulse switch control device of the present invention;

Fig. 11a and Fig. 11b are working principle diagrams of the eighth embodiment of the pulse switch control device of the present invention;

Fig. 12 is a schematic structural diagram of the high-frequency high-voltage pulse power supply of the present invention.

Detailed ways

The technical solution of the present invention will be described in further detail below in conjunction with the accompanying drawings.

In-depth research by the inventors of the present application shows that due to the lack of a good discharge circuit in the existing paired control mode, a virtual voltage is generated when the pulse state is switched, thus causing serious distortion of the pulse current or voltage waveform. For this reason, the present invention provides an adaptive pulse truncation control scheme according to load conditions. By forming a discharge circuit when the pulse state is switched, it can effectively eliminate delays caused by inductive loads, capacitive loads, and pulse electronic switching devices. The pulse current or voltage waveform smearing brought by the time can effectively reduce the distortion of pulse current or voltage waveform.

Fig. 3 is a schematic structural diagram of the pulse switch control device of the present invention. As shown in Figure 3, the main structure of the pulse switch control device of the present invention comprises an H-type bridge-type transmitting pulse module and a control module, and the control module is connected with the H-type bridge-type transmitting pulse module for controlling the H-type bridge-type transmitting pulse module to The load applies a forward pulse or a reverse pulse. When the forward pulse or reverse pulse is applied, the control module controls the H-bridge transmitting pulse module to form a discharge circuit. Pulse current or voltage waveform tailing caused by the turn-off delay of permanent loads and pulse electronic switching devices.

Specifically, the H-bridge transmitting pulse module of the present invention includes a first switch unit S ₁ (V _T1 and V _D1 ), a second switch unit S ₂ (V _T2 and V _D2 ), a third switch unit S ₃ (V _T3 and V _D3 ) and the fourth switching unit S ₄ (V _T4 and V _D4 ). In the structure shown in FIG. 3 , the equivalent circuit of each switching unit is a switching tube V _T and a diode V _D . In practical applications, a switching unit serving as an equivalent switching device can be composed of multiple single switching devices connected in series and parallel. The first switch unit S ₁ and the second switch unit S ₂ are connected in series between the positive and negative poles of the power supply, and the third switch unit S ₃ and the fourth switch unit S ₄ are connected in series between the positive and negative poles of the power supply, that is, the first switch _One end of the unit S1 and the _second switching unit S2 is connected through the first node A, and the other end is respectively connected with the positive and negative poles of the power supply, and one end of the _third switching unit S3 and the _fourth switching unit S4 is connected through the second node B , the other ends are respectively connected to the positive and negative poles of the power supply, and the load _RL is set between the first node A and the second node B, forming an H-type bridge circuit structure. In order to describe the technical solution of the present invention more clearly, the switch unit located at the diagonal position is called the diagonal switch group, and the switch unit located at the opposite position is called the opposite switch group, that is, the _first switch unit S1 and the second switch unit The four switch units S ₄ are called a diagonal switch group, the second switch unit S ₂ and the third switch unit S ₃ are called another diagonal switch group; the first switch unit S located on the load _RL side ₁ and the third switch unit S2 are called an opposite switch group, and the _second switch unit S2 and the _fourth switch unit S4 located _on the other side of the load _RL are called another opposite switch group.

The control module of the present invention includes a first control terminal u ₁ , a second control terminal u ₂ , a third control terminal u ₃ and a fourth control terminal u ₄ , the first control terminal u ₁ is connected to the first switch unit S ₁ , and the second _The control terminal u2 is connected to the _second switch unit S2, the third control terminal _u3 is connected to the _third switch unit S3, the _fourth control terminal u4 is connected to the _fourth switch unit S4, and each control terminal controls a corresponding The switch unit is turned on or off, so that the H-bridge transmitting pulse module applies forward or reverse pulses to the load. When the forward pulse or reverse pulse is applied, the H-bridge transmitting pulse module is controlled to form a discharge circuit. , The pulse current or voltage waveform tail caused by the inductive load, the capacitive load and the turn-off delay of the pulse electronic switching device is effectively cut off through the fast discharge circuit. Specifically, when transmitting pulses, the control terminal in the control module controls the switch units in one diagonal switch group to turn on, and the switch units in the other diagonal switch group to turn off, forming a pulse loop and applying positive pulses to the load Or reverse pulse; when the emission pulse stops, the control terminal in the control module controls the switch unit in one relative switch group to be turned on, and the other relative switch unit in the switch group is turned off to form a discharge circuit, which effectively cuts off the Pulse current or voltage waveform tailing caused by inductive load, capacitive load and off-delay of pulse electronic switching devices. The above connection between the control terminal and the switch unit is actually the connection between the control terminal and the switch tube in the switch unit.

The technical solution of the present invention will be described in detail below through specific examples.

first embodiment

4a to 4c are working principle diagrams of the first embodiment of the pulse switch control device of the present invention, and the control module of the present invention is represented by control terminals u ₁ , u ₂ , u ₃ and u ₄ .

When a forward pulse is applied to the load, the first control terminal u ₁ and the fourth control terminal u ₄ in the control unit respectively supply the switching tube V _T1 of the first switching unit S ₁ and the switching tube V of the fourth switching unit S _{4 T4} sends a conduction control signal to control the conduction of the first switch unit S ₁ and the fourth switch unit S ₄ , and the second control terminal u ₂ and the third control terminal u ₃ in the control unit are respectively sent to the second switch unit S ₂ The switch tube V _T2 and the switch tube V _T3 of the _third switch unit S3 send a turn-off control signal to control the _second switch unit S2 and the _third switch unit S3 to turn off, forming a loop for applying forward pulses. The forward current loop LP ₁ is: the positive pole of the DC power supply → the switching tube V _T1 of the first switching unit S ₁ → the first node A → the load _RL → the second node B → the switching tube V _T4 of the fourth switching unit S ₄ → The negative pole of the DC power supply applies positive pulses to the load _RL , as shown in Figure 4a.

When the positive pulse is applied to the load and stops, the _first control terminal u1 and the third control terminal _u3 in the control unit respectively send the switching tube V _T1 of the _first switching unit S1 and the switching tube of the _third switching unit S3 V _T3 sends a turn-off control signal to control the first switch unit S ₁ and the third switch unit S ₃ to turn off, and the second control terminal u ₂ and the fourth control terminal u ₄ in the control unit respectively send signals to the second switch unit S ₂ The switch tube V _T2 of the _fourth switch unit S4 and the switch tube V _T4 of the fourth switch unit S4 send a conduction control signal to control the conduction of the _second switch unit S2 and the _fourth switch unit S4 to form a discharge circuit. If the load is inductive, the fast discharge loop LP ₂ of the inductor current is: load _RL → the second node B → the switching tube V _T4 of the fourth switching unit S ₄ → the diode V _D2 of the second switching unit S ₂ → the first node A→load _RL , so as to cut off the tail of the pulse current waveform caused by the inductive load and the turn-off delay of the pulse electronic switching device, as shown in Figure 4b. If the load is capacitive, the fast discharge loop LP ₃ of the capacitive current is: load _RL → first node A → switching tube V _T2 of the second switching unit S ₂ → diode V _D4 of the fourth switching unit S ₄ → second Node B → load _RL , so as to cut off the tail of the pulse voltage waveform caused by the capacitive load and the turn-off delay of the pulse electronic switching device, as shown in Fig. 4c.

second embodiment

Figures 5a to 5c are working principle diagrams of the second embodiment of the pulse switch control device of the present invention, and the control module of the present invention is represented by control terminals u ₁ , u ₂ , u ₃ and u ₄ . On the basis of the above-mentioned technical solution of the first embodiment, the present embodiment is provided with a discharge load R on the discharge circuit, and the discharge current is reduced through the discharge load R to effectively protect the switch tube. Specifically, in this embodiment, the discharge load R is set between the first node A and the _second switch unit S2. In practical applications, the discharge load R can be set on the line connected in series with the _second switch unit S2, that is, it can be set on any side of the _second switch unit S2.

When a positive pulse is applied to the load, the working principle of this embodiment is the same as that of the first embodiment, and the forward current loop LP ₁ is: the positive pole of the DC power supply → the switching tube V _T1 of the first switching unit S ₁ → the first node A → Load _RL →second node B→switching tube V _T4 of the _fourth switch unit S4→negative pole of DC power supply, apply positive pulse to load _RL , as shown in FIG. 5a.

When the application of positive pulses to the load stops, the control process of each control terminal in this embodiment is the same as that in the first embodiment, forming a discharge circuit including the _second switch unit S2 and the _fourth switch unit S4. If the load is inductive, the fast discharge loop LP ₂ of the inductor current is: load _RL → second node B → switch tube V _T4 of the fourth switch unit S ₄ → diode V _D2 of the second switch unit S ₂ → discharge load R → the first node A → the load _RL , so as to cut off the tail of the pulse current waveform caused by the inductive load and the turn-off delay of the pulse electronic switching device, as shown in Fig. 5b. If the load is capacitive, the fast discharge loop LP ₃ of the capacitive current is: load _RL → first node A → discharge load R → switching tube V _T2 of the second switching unit S ₂ → diode V of the fourth switching unit S _{4 D4} →second node B→load _RL , so as to cut off the tail of the pulse voltage waveform caused by the capacitive load and the turn-off delay of the pulse electronic switching device, as shown in FIG. 5c.

third embodiment

Fig. 6a and Fig. 6b are working principle diagrams of the third embodiment of the pulse switch control device of the present invention, and the control module of the present invention is represented by control terminals u ₁ , u ₂ , u ₃ and u ₄ .

When a positive pulse is applied to the load, the working principle of this embodiment is the same as that of the first embodiment, and the forward current loop LP ₁ is: the positive pole of the DC power supply → the switching tube V _T1 of the first switching unit S ₁ → the first node A → Load _RL →second node B→switching tube V _T4 of the _fourth switch unit S4→negative pole of DC power supply, apply positive pulse to load _RL , as shown in FIG. 4a.

When the positive pulse is applied to the load and stops, the _first control terminal u1 and the third control terminal _u3 in the control unit respectively send the switching tube V _T1 of the _first switching unit S1 and the switching tube of the _third switching unit S3 V _T3 sends a conduction control signal to control the conduction of the first switch unit S ₁ and the third switch unit S ₃ , and the second control terminal u ₂ and the fourth control terminal u ₄ in the control unit are respectively connected to the second switch unit S ₂ The switching tube V _T2 of the _fourth switching unit S4 and the switching tube V _T4 of the fourth switching unit S4 send a shutdown control signal to control the switching off of the _second switching unit S2 and the _fourth switching unit S4 to form a discharge circuit. If the load is inductive, the fast discharge loop LP ₄ of the inductor current is: load _RL → the second node B → the diode V _D3 of the third switching unit S ₃ → the switching tube V _T1 of the first switching unit S ₁ → the first node A→load _RL , so as to cut off the tail of the pulse current waveform caused by the inductive load and the turn-off delay of the pulse electronic switching device, as shown in Figure 6a. If the load is capacitive, the fast discharge circuit LP ₅ of the capacitive current is: load _RL → first node A → diode V _D1 of the first switching unit S ₁ → switching tube V _T3 of the third switching unit S ₃ → second Node B→load _RL , so as to cut off the tail of the pulse voltage waveform caused by the capacitive load and the turn-off delay of the pulse electronic switching device, as shown in Figure 6b.

Fourth embodiment

Fig. 7a and Fig. 7b are working principle diagrams of the fourth embodiment of the pulse switch control device of the present invention, and the control module of the present invention is represented by control terminals u ₁ , u ₂ , u ₃ and u ₄ . On the basis of the technical solution of the aforementioned third embodiment, this embodiment is provided with a discharge load R on the discharge circuit, and the discharge current is reduced through the discharge load R to effectively protect the switch tube. Specifically, in this embodiment, the discharge load R is set between the second node B and the _third switch unit S3. In practical applications, the discharge load R can be set on the line connected in series with the _third switch unit S3, that is, it can be set on any side of the _third switch unit S3.

When a forward pulse is applied to the load, the working principle of this embodiment is the same as that of the third embodiment, and the forward current loop LP ₁ is: the positive pole of the DC power supply → the switching tube V _T1 of the first switching unit S ₁ → the first node A → Load _RL →second node B→switching tube V _T4 of the _fourth switch unit S4→negative pole of DC power supply, apply positive pulse to load _RL , as shown in FIG. 4a.

When the application of positive pulses to the load stops, the control process of each control terminal of this embodiment is the same as that of the third embodiment, forming a discharge circuit including the _first switch unit S1 and the _third switch unit S3. If the load is inductive, the fast discharge loop LP ₄ of the inductor current is: load _RL → second node B → discharge load R → diode V _D3 of the third switching unit S ₃ → switching tube V _T1 of the first switching unit S ₁ → the first node A → the load _RL , so as to cut off the tail of the pulse current waveform caused by the inductive load and the turn-off delay of the pulse electronic switching device, as shown in Fig. 7a. If the load is capacitive, the fast discharge loop LP ₅ of the capacitive current is: load _RL → first node A → diode V _D1 of the first switch unit S ₁ → switch tube V _T3 of the third switch unit S ₃ → discharge load R→second node B→load _RL , so as to cut off the tail of the pulse voltage waveform caused by the capacitive load and the turn-off delay of the pulse electronic switching device, as shown in FIG. 7b.

fifth embodiment

Figures 8a to 8c are working principle diagrams of the fifth embodiment of the pulse switch control device of the present invention, and the control module of the present invention is represented by control terminals u ₁ , u ₂ , u ₃ and u ₄ .

When the reverse pulse is applied to the load, the second control terminal u ₂ and the third control terminal u ₃ in the control unit respectively supply the switching tube V _T2 of the second switching unit S ₂ and the switching tube V of the third switching unit S _{3 T3} sends a conduction control signal to control the conduction of the _second switch unit S2 and the _third switch unit S3, and the _first control terminal u1 and the _fourth control terminal u4 in the control unit are respectively connected to the _first switch unit S1 The switching tube V _T1 and the switching tube V _T4 of the fourth switching unit S ₄ send a turn-off control signal to control the first switching unit S ₁ and the fourth switching unit S ₄ to turn off, forming a reverse pulse application loop. The reverse current loop LN ₁ is: the positive pole of the DC power supply → the switch tube V _T3 of the third switch unit S ₃ → the second node B → the load _RL → the first node A → the switch tube V _T2 of the second switch unit S ₂ → Negative pole of the DC power supply, apply a reverse pulse to the load _RL , as shown in Figure 8a.

When the reverse pulse is applied to the load and stops, the _first control terminal u1 and the third control terminal _u3 in the control unit respectively send the switching tube V _T1 of the _first switching unit S1 and the switching tube of the _third switching unit S3 V _T3 sends a turn-off control signal to control the first switch unit S ₁ and the third switch unit S ₃ to turn off, and the second control terminal u ₂ and the fourth control terminal u ₄ in the control unit respectively send signals to the second switch unit S ₂ The switch tube V _T2 of the _fourth switch unit S4 and the switch tube V _T4 of the fourth switch unit S4 send a conduction control signal to control the conduction of the _second switch unit S2 and the _fourth switch unit S4 to form a discharge circuit. If the load is inductive, the fast discharge loop LN ₂ of the inductor current is: load _RL → the first node A → the switching tube V _T2 of the second switching unit S ₂ → the diode V _D4 of the fourth switching unit S ₄ → the second node B→load _RL , so as to cut off the tail of the pulse current waveform caused by the inductive load and the turn-off delay of the pulse electronic switching device, as shown in Figure 8b. If the load is capacitive, the fast discharge loop LN ₃ of the capacitive current is: load _RL → the second node B → the switching tube V _T4 of the fourth switching unit S ₄ → the diode V _D2 of the second switching unit S ₂ → the first Node A→load _RL , so as to cut off the tail of the pulse voltage waveform caused by the capacitive load and the turn-off delay of the pulse electronic switching device, as shown in Figure 8c.

Sixth embodiment

Figures 9a to 9c are working principle diagrams of the sixth embodiment of the pulse switch control device of the present invention, and the control module of the present invention is represented by control terminals u ₁ , u ₂ , u ₃ and u ₄ . On the basis of the technical solution of the fifth embodiment described above, this embodiment is provided with a discharge load R on the discharge circuit, and the discharge current is reduced through the discharge load R to effectively protect the switch tube. Specifically, in this embodiment, the discharge load R is set between the second node B and the _fourth switch unit S4. In practical applications, the discharge load R can be set on a line connected in series with the _fourth switch unit S4, that is, it can be set on any side of the _fourth switch unit S4.

When a reverse pulse is applied to the load, the working principle of this embodiment is the same as that of the fifth embodiment, and the reverse current loop LN ₁ is: the positive pole of the DC power supply → the switching tube V _T3 of the third switching unit S ₃ → the second node B → Load _RL →first node A→switching tube V _T2 of the _second switch unit S2→negative pole of DC power supply, apply reverse pulse to load _RL , as shown in FIG. 9a.

When the application of the reverse pulse to the load stops, the control process of each control terminal of this embodiment is the same as that of the fifth embodiment, forming a discharge circuit including the _second switch unit S2 and the _fourth switch unit S4. If the load is inductive, the fast discharge loop LN ₂ of the inductor current is: load _RL → first node A → switch tube V _T2 of the second switch unit S ₂ → diode V _D4 of the fourth switch unit S ₄ → discharge load R → second node B → load _RL , so as to cut off the tail of the pulse current waveform caused by the inductive load and the turn-off delay of the pulse electronic switching device, as shown in Fig. 9b. If the load is capacitive, the fast discharge loop LN ₃ of the capacitive current is: load _RL → second node B → discharge load R → switching tube V _T4 of the fourth switching unit S ₄ → diode V of the second switching unit S _{2 D2} → first node A → load _RL , thereby cutting off the tail of the pulse voltage waveform caused by the capacitive load and the turn-off delay of the pulse electronic switching device, as shown in FIG. 9c.

Seventh embodiment

Fig. 10a and Fig. 10b are working principle diagrams of the seventh embodiment of the pulse switch control device of the present invention, and the control module of the present invention is represented by control terminals u ₁ , u ₂ , u ₃ and u ₄ .

When a reverse pulse is applied to the load, the working principle of this embodiment is the same as that of the fifth embodiment, and the reverse current loop LN ₁ is: the positive pole of the DC power supply → the switching tube V _T T _{3 of the third switching unit S 3 →} the second node B→load _RL →first node A→switching tube V _T2 of the _second switch unit S2→negative pole of DC power supply, apply reverse pulse to load _RL , as shown in Figure 8a.

When the reverse pulse is applied to the load and stops, the _first control terminal u1 and the third control terminal _u3 in the control unit respectively send the switching tube V _T1 of the _first switching unit S1 and the switching tube of the _third switching unit S3 V _T3 sends a conduction control signal to control the conduction of the first switch unit S ₁ and the third switch unit S ₃ , and the second control terminal u ₂ and the fourth control terminal u ₄ in the control unit are respectively connected to the second switch unit S ₂ The switching tube V _T2 of the _fourth switching unit S4 and the switching tube V _T4 of the fourth switching unit S4 send a shutdown control signal to control the switching off of the _second switching unit S2 and the _fourth switching unit S4 to form a discharge circuit.

If the load is inductive, the fast discharge loop LN ₄ of the inductor current is: load _RL → first node A → diode V _D1 of the first switching unit S ₁ → switching tube V _T3 of the third switching unit S ₃ → second node B→load _RL , so as to cut off the tail of the pulse current waveform caused by the inductive load and the turn-off delay of the pulse electronic switching device, as shown in Figure 10a. If the load is capacitive, the fast discharge loop _LN5 of the capacitive current is: load _RL →second node B→diode V _D3 of the third switch unit _S3 →switch tube V _T1 of the first switch unit S1→ _first Node A→load _RL , so as to cut off the tail of the pulse voltage waveform caused by the capacitive load and the turn-off delay of the pulse electronic switching device, as shown in Figure 10b.

Eighth embodiment

Fig. 11a and Fig. 11b are working principle diagrams of the eighth embodiment of the pulse switch control device of the present invention, and the control module of the present invention is represented by control terminals u ₁ , u ₂ , u ₃ and u ₄ . On the basis of the technical solution of the foregoing seventh embodiment, this embodiment is provided with a discharge load R on the discharge circuit, and the discharge current is reduced through the discharge load R, thereby effectively protecting the switch tube. Specifically, in this embodiment, the discharge load R is set between the first node A and the _first switch unit S1. In practical applications, the discharge load R can be set on a line connected in series with the _first switch unit S1, that is, it can be set on any side of the _first switch unit S1.

When a reverse pulse is applied to the load, the working principle of this embodiment is the same as that of the seventh embodiment, and the reverse current loop LN1 is: the positive pole _of the DC power supply → the switching tube V _T3 of the _third switching unit S3 → the second node B → Load _RL →first node A→switching tube V _T2 of the _second switch unit S2→negative pole of DC power supply, apply reverse pulse to load _RL , as shown in FIG. 8a.

When the application of the reverse pulse to the load stops, the control process of each control terminal of this embodiment is the same as that of the seventh embodiment, forming a discharge circuit including the _first switch unit S1 and the _third switch unit S3. If the load is inductive, the fast discharge circuit LN ₄ of the inductor current is: load _RL → first node A → discharge load R → diode V _D1 of the first switching unit S ₁ → switching tube V _T3 of the third switching unit S ₃ → the second node B → the load _RL , so as to cut off the tail of the pulse current waveform caused by the inductive load and the turn-off delay of the pulse electronic switching device, as shown in Fig. 11a. If the load is capacitive, the fast discharge loop LN ₅ of the capacitive current is: load _RL → second node B → diode V _D3 of the third switching unit S ₃ → switching tube V _T1 of the first switching unit S ₁ → discharge load R→first node A→load _RL , so as to cut off the tail of the pulse voltage waveform caused by the capacitive load and the turn-off delay of the pulse electronic switching device, as shown in FIG. 11b.

It can be seen from the above embodiments that when the forward or reverse pulses are applied to the load and stop, that is, when the pulse state is switched, the present invention effectively eliminates the problems caused by inductive loads, capacitive loads and pulsed electrons by forming a discharge circuit. The tailing of the pulse current or voltage waveform caused by the turn-off delay of the switching device effectively reduces the distortion of the pulse current or voltage waveform.

Fig. 12 is a schematic structural diagram of the high-frequency high-voltage pulse power supply of the present invention. As shown in Figure 12, the main structure of the high-frequency and high-voltage pulse power supply of the present invention includes a low-voltage DC power supply device, a high-power inverter device, a pulse transformer device, a pulse switch control device, an electric desalination and dehydration load, a control device and a detection device, wherein the pulse The switch control device adopts the structures of the aforementioned first to eighth embodiments. Specifically, the low-voltage DC power supply device is used to rectify and filter the low-voltage AC power, and output a low-voltage DC power supply with an adjusted amplitude; The bipolar low-voltage pulse power supply with adjusted output amplitude is modulated by the duty ratio; the pulse transformer device is connected with the high-power inverter device, which is used to boost and rectify and filter the bipolar low-voltage pulse power supply, and output high-voltage DC power supply The pulse switch control device is connected with the pulse transformer device, which is used to process the high-voltage DC power supply, and output the high-voltage high-frequency pulse power supply with adjusted frequency to the load; the detection device is connected to both ends of the load, and is used to monitor the output of the pulse switch control device The current and voltage of the high-voltage and high-frequency pulse power supply are used to obtain the output parameters; the control device is respectively connected with the low-voltage DC power supply device, the high-power inverter device, the pulse switch control device and the detection device, and is used to adjust the low voltage according to the output parameters monitored by the detection device. The amplitude of the low-voltage DC power output by the DC power supply device, the amplitude of the bipolar low-voltage pulse power output by the high-power inverter device, and the frequency of the high-voltage high-frequency pulse power output by the pulse switch control device.

The present invention also provides a pulse switch control method. The pulse switch adopts the aforementioned H-bridge transmission pulse module structure of the present invention, including a first switch unit, a second switch unit, a third switch unit and a fourth switch unit. H-type bridge transmitting pulse circuit, the first switch unit and the fourth switch unit, the second switch unit and the third switch unit respectively form a diagonal switch group, the first switch unit and the third switch unit, the second switch unit and the third switch unit The four switch units respectively form relative switch groups. Pulse switch control methods include:

When transmitting pulses, send a turn-on control signal to the switch unit in one diagonal switch group, and send a turn-off control signal to the switch unit in the other diagonal switch group to form a pulse loop;

When the transmitting pulse stops, a turn-on control signal is sent to the switch unit in one opposite switch group, and a turn-off control signal is sent to the switch unit in the other opposite switch group, forming a discharge circuit.

Wherein, the sending a turn-on control signal to the switch unit in one diagonal switch group and sending a turn-off control signal to the switch unit in another diagonal switch group specifically includes: sending the first switch unit and the fourth switch unit The unit sends a turn-on control signal, and sends a turn-off control signal to the second switch unit and the third switch unit; or sends a turn-off control signal to the first switch unit and the fourth switch unit, and sends a turn-off control signal to the second switch unit. The unit and the third switch unit send a conduction control signal.

Wherein, the sending a turn-on control signal to a switch unit in one relative switch group and sending a turn-off control signal to a switch unit in another relative switch group specifically includes: sending a switch control signal to the first switch unit and the third switch unit Turn off the control signal, send the conduction control signal to the second switch unit and the fourth switch unit; or send the conduction control signal to the first switch unit and the third switch unit, and send the conduction control signal to the second switch unit and the second switch unit The fourth switch unit sends a shutdown control signal.

The processing flow of the pulse switch control method of the present invention has been described in detail in the aforementioned technical solution of the pulse switch control device of the present invention, and will not be repeated here.

The above descriptions are only preferred embodiments of the present invention, and are not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and changes. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention shall be included within the protection scope of the present invention.

The invention is supported by the national high-tech research and development plan (863 plan). The project name is: research on key technology of industrialization of high-efficiency, energy-saving and environment-friendly crude oil chaotic pulse electric dehydrator, and the project number is: 2007AA05Z230. The invention has received special funding from the Beijing Municipal Education Commission's co-construction project. The present invention is funded by the forward-looking project of China University of Petroleum (Beijing), and the approval number is: 2010QZ03.

Claims (4)

1. A pulse switch control device is applied to a crude oil electric dehydration and desalination high-voltage pulse power supply, an electric dehydration and desalination load is capacitive, and the pulse switch control device comprises an H-shaped bridge type emission pulse module consisting of a first switch unit, a second switch unit, a third switch unit and a fourth switch unit, wherein the first switch unit, the fourth switch unit, the second switch unit and the third switch unit form a diagonal switch group, and the first switch unit, the third switch unit, the second switch unit and the fourth switch unit form a relative switch group; one end of the first switch unit is connected with one end of the second switch unit through a first node, the other end of the first switch unit is connected with the positive electrode and the negative electrode of the power supply, one end of the third switch unit is connected with one end of the fourth switch unit through a second node, the other end of the third switch unit is connected with the positive electrode and the negative electrode of the power supply, and a load is arranged between the first node and the second node; the pulse discharge circuit is characterized in that equivalent circuits of each switch unit are a switch tube and a diode, and the pulse discharge circuit also comprises a control module, wherein the control module is respectively connected with each switch unit and is used for controlling the switch unit in one diagonal switch group to be switched on and the switch unit in the other diagonal switch group to be switched off when a pulse is transmitted, so as to form a pulse circuit, and controlling the switch unit in one opposite switch group to be switched on and the switch unit in the other opposite switch group to be switched off when the pulse is transmitted to be stopped, so as to form a discharge circuit; wherein,

when a positive pulse is applied to a load and stops, a first control end and a third control end in a control module respectively send turn-off control signals to a switching tube of a first switching unit and a switching tube of a third switching unit to control the first switching unit and the third switching unit to turn off, a second control end and a fourth control end in the control module respectively send turn-on control signals to a switching tube of a second switching unit and a switching tube of a fourth switching unit to control the second switching unit and the fourth switching unit to turn on to form a discharging loop; for capacitive loads, the fast discharge loop for the capacitor current is: the load → the first node → the switching tube of the second switching unit → the diode of the fourth switching unit → the second node → the load, thereby cutting off the trailing of the pulse voltage waveform caused by the capacitive load and the turn-off delay of the pulse electronic switching device; or

When a positive pulse is applied to a load and stops, a first control end and a third control end in a control module respectively send conducting control signals to a switching tube of a first switching unit and a switching tube of a third switching unit to control the first switching unit and the third switching unit to be conducted, a second control end and a fourth control end in the control module respectively send turn-off control signals to a switching tube of a second switching unit and a switching tube of a fourth switching unit to control the second switching unit and the fourth switching unit to be turned off to form a discharging loop; for capacitive loads, the fast discharge loop for the capacitor current is: the load → the first node → the diode of the first switch unit → the switch tube of the third switch unit → the second node → the load, thereby cutting off the trailing of the pulse voltage waveform caused by the capacitive load and the turn-off delay of the pulse electronic switching device; or

When the reverse pulse is applied to the load and the load is stopped, a first control end and a third control end in the control module respectively send turn-off control signals to a switching tube of the first switching unit and a switching tube of the third switching unit to control the first switching unit and the third switching unit to be turned off, a second control end and a fourth control end in the control module respectively send turn-on control signals to a switching tube of the second switching unit and a switching tube of the fourth switching unit to control the second switching unit and the fourth switching unit to be turned on to form a discharging loop; for capacitive loads, the fast discharge loop for the capacitor current is: the load → the second node → the switching tube of the fourth switching unit → the diode of the second switching unit → the first node → the load, thereby cutting off the trailing of the pulse voltage waveform caused by the capacitive load and the turn-off delay of the pulse electronic switching device; or

When the reverse pulse is applied to the load and the load is stopped, a first control end and a third control end in the control module respectively send conducting control signals to a switching tube of the first switching unit and a switching tube of the third switching unit to control the first switching unit and the third switching unit to be conducted, a second control end and a fourth control end in the control module respectively send turn-off control signals to a switching tube of the second switching unit and a switching tube of the fourth switching unit to control the second switching unit and the fourth switching unit to be turned off to form a discharging loop; for capacitive loads, the fast discharge loop for the capacitor current is: the load → the second node → the diode of the third switching unit → the switching tube of the first switching unit → the first node → the load, thereby cutting off the trailing of the pulse voltage waveform caused by the capacitive load and the turn-off delay of the pulsed electronic switching device.

2. The pulse switch control device according to claim 1, wherein a discharge load is provided on the discharge circuit.

3. A pulse switch control method is applied to a crude oil electric dehydration and desalination high-voltage pulse power supply, an electric dehydration and desalination load is capacitive, a pulse switch comprises an H-shaped bridge type emission pulse circuit consisting of a first switch unit, a second switch unit, a third switch unit and a fourth switch unit, the first switch unit, the fourth switch unit, the second switch unit and the third switch unit form a diagonal switch group, and the first switch unit, the third switch unit, the second switch unit and the fourth switch unit form a relative switch group; one end of the first switch unit is connected with one end of the second switch unit through a first node, the other end of the first switch unit is connected with the positive electrode and the negative electrode of the power supply, one end of the third switch unit is connected with one end of the fourth switch unit through a second node, the other end of the third switch unit is connected with the positive electrode and the negative electrode of the power supply, and a load is arranged between the first node and the second node; the method is characterized in that an equivalent circuit of each switch unit is a switch tube and a diode, and the method comprises the following steps:

when the pulse is transmitted, a switch-on control signal is sent to a switch unit in one diagonal switch group, and a switch-off control signal is sent to a switch unit in the other diagonal switch group, so that a pulse loop is formed;

when the emission pulse stops, sending a switching-on control signal to a switch unit in one relative switch group and sending a switching-off control signal to a switch unit in the other relative switch group to form a discharge loop; wherein,

when a positive pulse is applied to a load and stops, a first control end and a third control end in a control module respectively send turn-off control signals to a switching tube of a first switching unit and a switching tube of a third switching unit to control the first switching unit and the third switching unit to turn off, a second control end and a fourth control end in the control module respectively send turn-on control signals to a switching tube of a second switching unit and a switching tube of a fourth switching unit to control the second switching unit and the fourth switching unit to turn on to form a discharging loop; for capacitive loads, the fast discharge loop for the capacitor current is: the load → the first node → the switching tube of the second switching unit → the diode of the fourth switching unit → the second node → the load, thereby cutting off the trailing of the pulse voltage waveform caused by the capacitive load and the turn-off delay of the pulse electronic switching device; or

When a positive pulse is applied to a load and stops, a first control end and a third control end in a control module respectively send conducting control signals to a switching tube of a first switching unit and a switching tube of a third switching unit to control the first switching unit and the third switching unit to be conducted, a second control end and a fourth control end in the control module respectively send turn-off control signals to a switching tube of a second switching unit and a switching tube of a fourth switching unit to control the second switching unit and the fourth switching unit to be turned off to form a discharging loop; for capacitive loads, the fast discharge loop for the capacitor current is: the load → the first node → the diode of the first switch unit → the switch tube of the third switch unit → the second node → the load, thereby cutting off the trailing of the pulse voltage waveform caused by the capacitive load and the turn-off delay of the pulse electronic switching device; or

When the reverse pulse is applied to the load and the load is stopped, a first control end and a third control end in the control module respectively send turn-off control signals to a switching tube of the first switching unit and a switching tube of the third switching unit to control the first switching unit and the third switching unit to be turned off, a second control end and a fourth control end in the control module respectively send turn-on control signals to a switching tube of the second switching unit and a switching tube of the fourth switching unit to control the second switching unit and the fourth switching unit to be turned on to form a discharging loop; for capacitive loads, the fast discharge loop for the capacitor current is: the load → the second node → the switching tube of the fourth switching unit → the diode of the second switching unit → the first node → the load, thereby cutting off the trailing of the pulse voltage waveform caused by the capacitive load and the turn-off delay of the pulse electronic switching device; or

When the reverse pulse is applied to the load and the load is stopped, a first control end and a third control end in the control module respectively send conducting control signals to a switching tube of the first switching unit and a switching tube of the third switching unit to control the first switching unit and the third switching unit to be conducted, a second control end and a fourth control end in the control module respectively send turn-off control signals to a switching tube of the second switching unit and a switching tube of the fourth switching unit to control the second switching unit and the fourth switching unit to be turned off to form a discharging loop; for capacitive loads, the fast discharge loop for the capacitor current is: the load → the second node → the diode of the third switching unit → the switching tube of the first switching unit → the first node → the load, thereby cutting off the trailing of the pulse voltage waveform caused by the capacitive load and the turn-off delay of the pulsed electronic switching device.

4. A high-frequency high-voltage pulse power supply using the pulse switch control device according to any one of claims 1 to 2, comprising a low-voltage DC power supply device, a high-power inverter device, a pulse transformer device, a control device and a detection device,

the low-voltage direct-current power supply device is used for rectifying and filtering low-voltage alternating current and outputting a low-voltage direct-current power supply with an adjusted amplitude;

the high-power inverter is connected with the low-voltage direct-current power supply device and is used for inverting the low-voltage direct-current power supply and modulating and outputting a bipolar low-voltage pulse power supply with an adjusted amplitude value through a duty ratio;

the pulse transformer device is connected with the high-power inverter device and is used for boosting, rectifying and filtering the bipolar low-voltage pulse power supply and outputting a high-voltage direct-current power supply;

the pulse switch control device is connected with the pulse transformer device and outputs a high-frequency high-voltage pulse power supply with adjusted frequency to a load;

the detection device is used for monitoring the current and the voltage of the high-frequency high-voltage pulse power supply output by the pulse switch control device to obtain output parameters;

the control device is respectively connected with the low-voltage direct-current power supply device, the high-power inverter device, the pulse switch control device and the detection device and is used for adjusting the amplitude of the low-voltage direct-current power supply, the amplitude of the bipolar low-voltage pulse power supply and the frequency of the high-frequency high-voltage pulse power supply according to the output parameters.